Update CODEOWNERS to shared Python SDK and CLI team

[cenedhryn]

Summary

Update CODEOWNERS to reference the shared Python SDK and CLI team.

The Python SDK and CLI currently share repository ownership, so CODEOWNERS references the shared team (@boto/sync-team-aws-python-sdk-cli-team).

Part of Python-8717.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.68%. Comparing base (8647a30) to head (71a58b1).
⚠️ Report is 36 commits behind head on develop.
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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #403      +/-   ##
===========================================
+ Coverage    80.28%   81.68%   +1.40%     
===========================================
  Files           16       16              
  Lines         3013     3184     +171     
===========================================
+ Hits          2419     2601     +182     
+ Misses         594      583      -11     

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